One example code block... do remember to not have whitespace either before the opening <?php or after the closing ?>.

public.application.private_things_stay_private.php

<?php

$_LW->REGISTERED_APPS['private_things_stay_private']=array( // register this application
	'title' => 'Private Things Stay Private', 
	'handlers' => array('onLoad', 'onWidgetLoad'),
);

class LiveWhaleApplicationPrivateThingsStayPrivate {

  protected $private_allowed = array(
    '/careers/',
    );

  public function onLoad() {
    global $_LW;
    $_LW->logDebug("PRIVATE LOADED");
  }

  public function onWidgetLoad($xml) { // alter widget arguments prior to execution; $xml is a SimpleXML object.
    global $_LW;
    // there should be some if statement here that applies this to everywhere but certain paths
    // perhaps using some paths in a protected array, above? (Whatever works here.)
    // it could be: if (strpos($_SERVER['PHP_SELF'], $doc_root_path) === 0) return $xml;
    // otherwise apply the following
    $arg = $xml->addChild('arg', 'LawKey-Private'); // add a child node to the root <widget> element
    $arg->addAttribute('id', 'exclude_tag'); // add the id attribute
    return $xml; // return the updated widget
  }

}

?>